Pulverizing mill



y 1942- c. J. FETERSQN 2,290,379

VIPULVERIZING MILL Filed Oct. 24, 1939 2 Sheets-Sheet 1 I/VYE/V TOH.

I Cumin/c: Jo/m PETE/50M y 1942- c. J. PETERSON I 2,290,379

PULVERIZING MILL Filed Oct. 24, 1939 2 Sheets-Sheet 2 r mvuvron.gins/v05 Joy/v P5 ransomthe housing I.

STATS PULVERIZING MILL Clarence John Peterson, Bakersfield, Calif.

Application October 24, 1939, Serial No. 300,954

3 Claims.

This invention relates to a pulverizing mill of the vertical type, andthe prime object of my invention is to provide a novel means ofcirculating air vertically through the mill, and particularly overtherotor.

Another object is to provide a novel pulverizing mill of the characterstated, which will effectively cut and break products, such as alfalfahay, dried fruits, as well as other products such as gypsum, talc,asbestos, and the like.

A feature of my invention resides in the novel primary cutter over whichthe product worked upon must pass prior to engaging the secondary rotoror beater.

Other objects, advantages and features of'invention may appear from theaccompanying drawings, the subjoined detailed description, and theappended claims.

In the drawings:

Figure 1 is .a longitudinal, sectional view of my pulverizing mill.

Figure 2 is a sectional view taken on line 2-2 of Figured. U

Figure 3 is a plan view of the primary cutter.

Figure 4 is a fragmentary, perspective view of the beater or rotor.

annular opening I6 is left around the tube 3.

Referring more particularly to the drawings the numeral i indicates anouter housing, which is preferably cylindrical, and is positionedvertically,as shown. The housing I rests on a base 2,

' and this base may be separately cast or may be integrally formed withthe housing, but, as here shown, the housing is bolted to the base. Anintake tube 3 is arranged within the housing i, and is substantiallycentral within the housing. The tube 3 extends substantially the fulllength of the housing I, the purpose of which will be further described.

A hopper extends into the upper end of the tube 3, and this hopper mayinclude the bell portion 6 of the tube. A drive shaft 5 is journaled inthe base 2 and is driven from a suitable source of power, not shown. Adriven shaft 6 is joumaled in the base 2 and is positioned vertically asshown. A gear I on the shaft 5 meshes with the gear 8 secured to theshaft 6, whereby the shaft 6 is continuously rotated. A sleeve 9, whichis a part of the base 2, encloses the upper portion of the shaft 6, andthis sleeve, as well as the shaft, extend into the lower part of Aprimary cutter I0 is fixedly secured to the upper end of the shaft 6,and this cutter is positioned within the tube 3, and prefe'rably in thelower part of this tube. The cutprovided with radial teeth II. Theperiphery of the cutter i0 is spaced from'the inner wall of the tube 3so that materialcan pass downward between the cutter and the tube.

An intake duct I2 is provided in the base 2, and the opening l3 in theupper wall of the duct i2 permits air to pass into the lower part of thehousing i. The opening l3 surrounds the sleeve 9, and consequently airis admitted to the housing at the center and then passes outwardlytowards the wall of the housing due to the action of the rotor, as willbe further described. An

The diaphragm l5 acts as a baflle to direct the air inwardly through theopening it, and thence upwardly to the outlet l4. 2d

A rotor or beater H is arranged vertically with in the lower portion ofthe housing I, and consists of a lower ring l8, which is connected byarms it to a central cup support 20. This central cup support is fixedlyattached to the upper end of the shaft 6, and immediately below thecutter l0, thus providing a drive for the rotor from the driven shaft 6.The upper ring ill of the rotor is supported through arms 22 to anannular bearing 23 on the tube 3. A plurality of beater fingers 2d arearranged in vertical sets on posts 25, which posts are mounted in therings l8 and ii. Spacing washers 26 hold the fingers 1 26 in. properspaced vertical position. When the Duejto the construction of the rotor11, it will act as a vertical fan, drawing air through the duct l2 andthe opening it, thence upwardly past the diaphragm l5, and finallypassing out through the outlet pipe l4.- It will be noted that the lowerend of the tube 3 is relatively close to the intake opening l3, andconsequently the in coming material, which has been partially broken bythe cutter to, will then be picked up by the incoming stream and carriedoutwardly by the action ofthe rotor l1, and will be constantly agitatedwithin the area covered by the rotor,

ter I0 is circular, as shown in Figure 3, and is '55 and when finallybroken up, the material will the base 2, these outlet spaces beingarranged on each side of the enclosed area, shown in Figure 1, whichincludes the shafts and the intake duct. The material being conveyedinto the rotor adjacent the lower portion thereof, and; then sweptupwardly by the current of air passing through the mill, will moreeffectively distribute the material throughout the rotor area, and willmore effectively pulverize the material passing through the mill.

The diaphragm l5 covers the periphery of the rotor l1, and thus thematerial being acted upon cannot be blown upwardly along the peripheryof the rotor, and thence out of the mill. This diaphragm holds thematerial down and only very light dust-like particles can pass aroundthis diaphragm.

Having described my invention, I claim:

1. A pulverizing mill comprising a housing, a central material intaketube positioned within the housing, a material outlet at the bottom ofthe housing, a vertical shaft journaled in the housing, drive meansextending to said shaft, a rotor mounted on the shaft, said rotorsurrounding the lower part of the material intake tube, an air intakeduct in the housing below,the rotor,

and an outlet pipe extending from said housing adiacent the upper endthereof, a primary cutter mounted on said shaft, said primary cutterbeing positioned within the material intake tube.

2. A pulverizing mill comprising a cylindrical housing, a centralmaterial intake tube extending substantially the length of said housingand cendrop downwardly through the spaces 29, 29 in trally arrangedtherein, a material outlet at the bottom of the housing, a verticalshaft journaled in the housing, drive means extending to said shaft, arotor mounted on said shaft and arranged within the housing, said rotorpartially surrounding the material intake tube, an air intake ductextending into the housing below said rotor, said air intake ductopening into the housing in substantially the center thereof, an airoutlet pipe extending from said housing above the rotor, and a primarycutter mounted on said shaft, said primary cutter being positionedwithin the material intake tube.

' 3. A pulverizing mill comprising a cylindrical housing, a centralmaterial intake tube extending substantially the length of said housingand centrally arranged therein, a material outlet at the bottom of thehousing, a vertical shaft journaled in the housing, drive meansextending to said shaft, a rotor mounted on said shaft and arrangedwithin the housing, said rotor partially surrounding the material intaketube, an air intake duct extending into the housing below said rotor,said air intake duct opening into the housing in substantially thecenter thereof, an air outlet pipe extending from said housing above therotor, and a primary cutter mounted on said shaft, said primary cutterbeingpositioned within the material intake tube, a stationary annulardiaphragm within the housing, said diaphragm projecting inwardly fromsaid housing and being positioned above the rotor.

CLARENCE JOHN PETERSON.

